10 yr rackets mint

I was surfing the bay, looking at a couple prokennexes, when a seller popped up selling rackets from the 90's that were unused (including a doonay pro one int.). The thing is, the price was in the 300-400 dollar range!!! Now that got me thinking: if I buy up some random frames now (say, some Head Microgel Prestige Pro's in 4 1/2) let them sit around for 10 years and then sell them, how much will the price of those frames go up?

I was surfing the bay, looking at a couple prokennexes, when a seller popped up selling rackets from the 90's that were unused (including a doonay pro one int.). The thing is, the price was in the 300-400 dollar range!!! Now that got me thinking: if I buy up some random frames now (say, some Head Microgel Prestige Pro's in 4 1/2) let them sit around for 10 years and then sell them, how much will the price of those frames go up?